enhance(frontend): improve forms usability

packages/frontend/src/components/MkFormFooter.vue

@@ -0,0 +1,49 @@
+<!--
+SPDX-FileCopyrightText: syuilo and misskey-project
+SPDX-License-Identifier: AGPL-3.0-only
+-->
+
+<template>
+<div :class="$style.root">
+	<div :class="$style.text">{{ i18n.tsx.thereAreNChanges({ n: form.modifiedCount.value }) }}</div>
+	<div style="margin-left: auto;" class="_buttons">
+		<MkButton danger rounded @click="form.discard"><i class="ti ti-x"></i> {{ i18n.ts.discard }}</MkButton>
+		<MkButton primary rounded @click="form.save"><i class="ti ti-check"></i> {{ i18n.ts.save }}</MkButton>
+	</div>
+</div>
+</template>
+
+<script lang="ts" setup>
+import { } from 'vue';
+import MkButton from './MkButton.vue';
+import { i18n } from '@/i18n.js';
+
+const props = defineProps<{
+	form: {
+		modifiedCount: {
+			value: number;
+		};
+		discard: () => void;
+		save: () => void;
+	};
+}>();
+</script>
+
+<style lang="scss" module>
+.root {
+	display: flex;
+	align-items: center;
+}
+
+.text {
+	color: var(--warn);
+	font-size: 90%;
+	animation: modified-blink 2s infinite;
+}
+
+@keyframes modified-blink {
+	0% { opacity: 1; }
+	50% { opacity: 0.5; }
+	100% { opacity: 1; }
+}
+</style>